For hot air cabinet dryer followed by microwave oven drying
method, moisture ratio-time diagram of grapes along the drying
period is shown in Fig. 2 when grapes dried achieved by
starting drying in hot air cabinet dryer for 30 min, 60 min
and 120 min and finishing drying in microwave oven for
1 min at different power levels. As seen in Fig. 2, an increase